Conical shell illumination incorporating a moving aperture for depth-resolved high-energy X-ray diffraction.
Conical shell illumination incorporating a moving aperture for depth-resolved high-energy X-ray diffraction.
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锥形壳照明结合了用于深度分辨高能 X 射线衍射的移动光圈。
DOI：
10.1039/d2an01842j
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Spence D
中科院分区：
文献类型：
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作者：
Spence D
在许多应用中，X射线吸收方法的主要局限性是测量的信号是衰减系数的函数，这几乎不能告诉我们被检查对象的化学或晶体性质。要计算基本的结晶学参数，需要测量样品的衍射光子。标准的实验室衍射法经过一个多世纪的改进，为精心准备的样品和单晶提供了‘金标准’结构模型，但对于许多筛选应用所要求的厚的非均质样品几乎没有适用性。我们提出了一种新的高能X射线衍射探头，与以往的深度分辨空心束技术相比，它需要单光束、点探测器和简单的扫描孔径来解析检查空间内未知位置的样品信号。我们进行蒙特卡罗模拟，以支持单材料和多材料局部化和识别的实验。新的探头使用低成本的商业组件进行配置和测试，为爆炸物检测、过程控制和诊断等应用提供快速且经济高效的解决方案。
In many applications, the main limitation of X-ray absorption methods is that the signals measured are a function of the attenuation coefficient, which tells us almost nothing about the chemical or crystallographic nature of objects under inspection. To calculate fundamental crystallographic parameters requires the measurement of diffracted photons from a sample. Standard laboratory diffraction methods have been refined for well over a century and provide ‘gold standard’ structural models for well-prepared samples and single crystals but have little applicability for thick heterogeneous samples as demanded by many screening applications. We present a new high-energy X-ray diffraction probe, which in comparison with previous depth-resolving hollow beam techniques, requires a single beam, point detector and a simple swept aperture to resolve sample signatures at unknown locations within an inspection space. We perform Monte Carlo simulations to support experiments on both single- and multiple-material localisation and identification. The new probe is configured and tested using low-cost commercial components to provide a rapid and cost-effective solution for applications including explosives detection, process control and diagnostics.